Yes. Low T can be associated with AF. I have had low T since puberty and had many instances of AF over the years, but T was never tested. I found out in my late 20's I had it, but by then a lot of damage was done and I found out i wasn't able to father children. Now I am 53, miserable, have several autoimmune diseases and T levels that won't stabilize. If you can, get it stabilized as soon as possible.